| ACT | COUNTRYCNT | EDITIONED | FESTIVALFES |
|---|---|---|---|
| ORCHESTRE TOUT PUISSANT MARCEL DUCHAMP | CHSwitzerland 2015 | | |
| Ordure | NLNetherlands 2015 | | |
| Orla Gartland | IEIreland 2015 | | |
| Oscar & the Wolf | BEBelgium 2015 | | |
| Oso Leone | ESSpain 2015 | | |
| Okta Logue | DEGermany 2014 | | |
| Orange Skyline | NLNetherlands 2014 | | |
| OWLLE | FRFrance 2014 | | |
| Oyama | ISIceland 2014 | | |
| O-Bat & the Undead | NLNetherlands 2013 | | |
| Orange Skyline | NLNetherlands 2013 | | |
| Orelha Negra | PTPortugal 2013 | | |
| Orgel Vreten | NLNetherlands 2013 | | |
| Ortega | NLNetherlands 2013 | | |
| Oscar and the Wolf | BEBelgium 2013 | | |
| Ojajoh?! | NLNetherlands 2012 | | |
| Old Jerusalem | PTPortugal 2012 | | |
| Olivia Pedroli | CHSwitzerland 2012 | | |
| Ome Omar | NLNetherlands 2012 | | |
| Ólöf Arnalds | ISIceland 2011 | | |
| Only Seven Left | NLNetherlands 2011 | | |
| OqueStrada | PTPortugal 2011 | | |
| Ost & Kjex | NONorway 2011 | | |
| OY | CHSwitzerland 2011 | | |
| Oceana Company | NLNetherlands 2010 | | |
| One Trick Pony | NLNetherlands 2010 | | |
| Óriás | HUHungary 2010 | | |
| Orka | FOFaroe Islands 2010 | | |
| Ou Est Le Swimming Pool | UKUnited Kingdom 2010 | | |
| Ottoboy the Onemantrashband | NLNetherlands 2009 | | |
| Our Broken Garden | DKDenmark 2009 | | |
| Ólafur Arnalds | ISIceland 2008 | | |
| Olga Kouklaki | GRGreece 2008 | | |
| Op:l Bastards | FIFinland 2008 | | |
| Orgasmic | FRFrance 2008 | | |
| Oh No Ono | DKDenmark 2007 | | |
| Ozark Henry | BEBelgium 2007 | | |
| Ojos de Brujo | ESSpain 2006 | | |
| Opgezwolle | NLNetherlands 2006 | | |
| Oszibarack | PLPoland 2006 | | |
| OctavePussy | NLNetherlands 2005 | | |
| One Dimensional Man | ITItaly 2005 | | |
| Orange Glow | NLNetherlands 2005 | | |
| Original | NLNetherlands 2005 | | |
| Orlando | NLNetherlands 2005 | | |
| Overhead | FRFrance 2005 | | |
| O.D. Babe | NLNetherlands 2004 | | |
| Oil | NLNetherlands 2004 | | |
| Oi Va Voi | UKUnited Kingdom 2004 | | |
| Olabola | NLNetherlands 2004 | |